This is really ancient stuff. He apears to be an ancestor to everyone who is descended from Robert the Bruis (which includes everybody who's a descendant of William Alexander (Lord Stirling).
I thought "Frosty" was about a snowman who became animated. It's more like "Frosty" was a Finnish King who was defeated by the Norse at the founding of Sweden. There have to be children's fairy tales that include him.
Sounds like someone has been smoking some rather strong Frankincense.